Hebrews 4:13

Neither is there any creature that is not manifest in His sight; but all things are naked and opened unto the eyes of Him with whom we have to do.

The exhortation follows naturally from the exposition: Let us, then, earnestly strive to enter into that rest, lest anyone fall in the same sort of unbelief. Christians should be eager, they should make every effort, they should strive with all the power of their regenerated heart to enter into that rest which is held out before them by the promise of God. The children of Israel in the wilderness had the Word of God proclaimed to them; the promise of salvation had been held out to them by Moses, but they had refused to heed and obey, they had not believed the precious and glorious message. Their behavior, therefore, will serve as a warning example for all times, to keep men from becoming guilty of a like transgression and being rejected by God as disobedient and unbelieving children.

For this matter is not to be thought of lightly, as the sacred writer proceeds to show: For living is the Word of God and effective and sharper than any two-edged sword, and penetrating to the very division of soul and spirit, joints and marrow, and judging the conceptions and ideas of the heart. If the message of salvation were a dead, ineffective sound, an unbeliever might have the excuse that he had gotten no value out of his hearing the Word. But we are told that the Word of God is living, instinct with the wonderful life of its source, full of quickening power, John 6:63; 1 Peter 1:23. It is in itself active, effective, energetic, able to carry out the work which it was intended to do, Jeremiah 23:29; Romans 1:16. It is keener, sharper than any two-edged sword, Revelation 1:16; Revelation 2:12; Ephesians 6:17. Its penetrating power is so great that it pierces to the very division of soul and spirit: it cuts apart, it makes a clear line of division between the old natural and the new spiritual life of a man, just as a Damascus blade will cleave the joints and lay bare the marrow of the bones, Acts 2:37. The entire passage is figurative, of course, the writer's object being to produce an effect by the rhetorical fullness of the expression. In plain words, as he adds, the Word of God judges the conceptions and ideas of the heart. The innermost ideas and deepest movements of the heart are open before the all-seeing eye of God and before the omniscience of His Word, John 3:20; 1 Corinthians 14:24. There is nothing hidden before the proclamation of God's will, both the holy and just will and the good and gracious will; He knows our hearts far better than we ourselves know them, and His Word opens up to us hidden depths of which we ourselves never dreamed.

The emphasis is continued in the next verse: And no created thing is unrevealed before Him, but all things lie naked and exposed before His eyes with whom is our reckoning. The figure used by the inspired writer at this point is that of a sacrificial animal whose head was bent back and then cut open, exposing the interior to the inspection of the priest. The person who fatuously believes that he is able to keep some transgression, some sinful condition hidden before the eyes of God and the penetrating power of His Word, is deceiving himself. No man may forget for any length of time that there will be a final reckoning, at which time all the hypocrisy and deceit practiced by men will be exposed and laid bare in all its hideous nakedness. Knowing this, we Christians will certainly abstain from all attempts at deceiving the omniscient Lord and strive with all earnestness to enter into that rest which is prepared for us in the mansions of our Lord. For how can we escape if we neglect so great salvation? Hebrews 2:3.